Mining machine



W. A. LOGAN MINING MACHINE July 9, 1935.

Filed Nov. 8,- 1954 2 Sheets-Sheet 1 July 9, 1935. 0 w. A. LOGAN MININGMACHINE Filed Nov. 8, 1934 v 2 Sheets-Shee t 2 Patented July 9, 1935PATENT OFFICE MINING MACHINE William Archibald Logan, Kinghorn, ScotlandApplication November 8, 1934, Serial No. 752,007 In Great BritainNovember 9, 1933 4 Claims.

This invention relates to improvements in mining machines.

As is understood, in jib cutters of the type heretofore in use thecutter boxes are guided between spaced jib plates, the inner end of eachbox having out-turned toes engaging guideways in the jib plates.

With this arrangement the overhang of the picks is considerable, so thatwith any play of the cutter boxes the picks are liable to deviateconsiderably from the desired lineof cut.

Further, the jib plates are liable to be splayed and so permit abnormalplay of the cutter boxes.

The present invention has for an object to provide an improvedconstruction in which the cutter boxes are made to straddle the edge ofthe jib which can be made much narrower than hitherto.

Desirably, the cutter boxes are provided with inturned toes engagingguideways in the top and 90 bottom faces of the jib.

With this arrangement the overhang of the picks from the point ofsupport is reducedconsiderably and the chain is retained in its path ina more rigid manner than heretofore.

The cutter boxes may be additionally guided by providing each cutter boxwith a tongue engaging a peripheral guideway in. the edge face of thejib.

The cutter boxes are identical and interchangegrammatic plan view of thecutter jib drawn to a smaller scale. I

As shown, I denotes the cutter jib and 2 (Fig. 5) denotes the sprocketwheel for circulating the cutter chain 3, ii around the jib I. g Thecutter chain comprises cutter boxes 3 interconnected by pairs of linkst, the cutter boxes 3 and the links l being slidingly guided on the jib'I. Each cutter box 3 is of U-form, being unitary with spaced limbs 5which straddle the edge of the jib l and which present inturned toes 6engaging guide grooves I formedone in the top face and one in the bottomface of the jib I. Each cutter box 3 slidingly engages at 8 theedge faceof the jib I, as do'also the inner edge faces 4 of the links 4. Aperipheral guideway 9 formed in the edge of the jib I receives aguidetongue It integral with and projecting inwardly from each cutterbox 3, said tongue I0 extending between a pair of lugs II integralwiththe cutter able, being interconnected by and alternatingbox andpivotally connected to the links 4 by means of stepped rivets I2penetrating registering apertures in the lugs I I and links 4.

Manifestly, the construction is such that the cutter boxes areefficiently guided and supported by the top, bottom and edge faces ofthe jib, the inturned toes 6 serving merely to resist centrifugal actionon the slack flight of the cutter chain. Further, shallower jibs can beused than hitherto, permitting narrower cuts, while the overhang of thecutters or picks is substantially reduced, giving a more rigid anddurable construction. 7

v The invention is not limited to the particular constructionillustrated.

For example, the cutter boxes may be otherwise linked together. Thelinks4 may be dispensed with and the cutter boxes directly connected to oneanother by means of extended lugs integral with the cutter boxes andserving to provide the requisite inter-box spaces for engagement by theteeth of the chain-driving sprocket wheel 2. Again, the links may befitted to overlap the top and bottom faces of the jib.

I claim: v I

1. In a mining machine, in combination, a cutter jibformed on its edgeface with a peripheral guideway, and a circulating cutter chainsupported by said jib, said cutter chain comprising cutter boxes, eachof substantially U-form to straddle the edge of said jib and having atongue engaging said guideway, and links interconnecting said cutterboxes.

2. In a mining machine, in combination, a cutter jib presentingguideways in its top and bot-- tom faces and a peripheral guideway inits edge face, and a circulating cutter chain supported by said jib,said cutter chain comprising cutter boxes, each of substantially U-formto straddle the edge 'of said jib and having inturned toes engageablewith the guideways in the top and bottom faces of said jib and a tongueengaging said peripheral guideway, and. links interconnecting saidcutter boxes, the inner edges of said links being guided on the edgeface of said jib.

3. A cutter box for a mining machine, said box being of substantiallyU-form to straddle the edge of the machine jib and presenting on itsinner face a tongue to engage a guideway in the edge face of said jib.

4. A cutter box fora mining machine, said box being of substantiallyU-form to straddle the edge of the machine jib and having inturned toesto engage guideways in the top and bottom faces of said jib, and atongue to engage a peripheral guideway in the edge face of said jib.

WILLI AM ARCHIBALD LOGAN.

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